Marine boiler.



E. KING.

MARINE BOILER.

APPLIOATION FILED MAR. 11. 1910.

1,015,689. Patented Jan. 23, 1912.

EDWARD KING, or ZURICH, SWITZERLAND.

MARINE BOILER.

Specification of Letters Patent.

Patented Jan. 23, 1912.

Application filed March 11, 1910. Serial No. 548,742.

To all whom it may concern:

Be it known that I, EDWARD KING, a subject of the King of England, residing at 51 Kilchbergstrasse, Zurich, Switzerland, have invented certain new and useful Improvements in Marine Boilers, of which the following is a specification.

The present invention relates to marine boilers of the internally fired type, and has for its purpose to construct such a boiler to effect a more rapid circulation of the water and at the same time to increase the surface which comes directly into contact with the products of combustion, to the end of obtaining a more eflicient boiler without extending the dimensions of the boiler itself.

A further object of the. invention is to construct a boiler with means giving ready access to the fire tubes from the exterior of the boiler; and wherein such means enables a relatively large volume of water to be subjected to the heating flameat the place of its greatest efliciency; and wherein said means provides a guard or barrier for the flame with respect to that portion of the boiler which is usually subjected to the damaging influence of the direct flame.

With these and other objects in view the invention consists in the arrangement and combination of parts hereinafter claimed, and while the invention is not restricted to the exact details shown and described, still for the purpose of disclosure reference is had to the accompanying drawing wherein is illustrated a longitudlnal sectional view through a'boiler constructed in accordance with my invention.

Referring to the construction in detail the boiler consists of a shell a providing a substantially central tube chamber 2) for the fire tubes 0, a rear water chamber cl, and a lower or bottom water chamber 6. The water chambers 03 and e are in direct communication, and the rear chamber 03 communicates with the tube chamber 1). A fire box consisting of a grate f, and a bridge wall 9 is located intermediate the water chamber 6 and the tube chamber 6, and the inner walls of said chambers 79 and e and of the chamber (2 provide a flue h and a reversing chamber 2' that receive the products of combustion directly from the fire box as will be understood.

A tubular body .2 of relatively large diameter connects the rear water chamber d with the tube chamber 6 providing a water passageway therebetween, and which by reason of its location with respect to the flue h and reversing chamber 2' subjects a relatively large volume'of water in said tubular body to the action of the flame at the place of greatest efliciency of said flame. The tubular body 2 also provides a guard or barrier for the flame with respect to the wall portion at the juncture of the rear and bottom walls of the tube chamber b and thoroughly protects said wall portion from the dangerous effects of the direct flame. A man-hole 7c is located in the boiler shell a in register with the horizontal leg of the tubular body 2 and provides with said tubular body a man-passageway giving ready ac cess to the tube chamber 7) from the exterior of the boiler.

This design of boiler insures a very thorough circulation of the water from the lower to the upper part of the boiler and also from the rear toward the front. The tubular body being arranged as described leads the water from the lower part of the boiler upwardly and from the rear to the front in a current counter to that taken by the flame and hot gases, which flame and gases pursue a serpentine course such as that indicated by the arrows in the illustration. The hot water is thereby distributed equally and continually to all parts of the boiler, and leakage of the latter, due to unequal expansion of the different portions of the boiler, is accordingly prevented. The circulation of the water is also efl'ected at themost important place in the heating surface, and said surface is of maximum extent at the place of greatest efliciency of the flame.

It is obvious that those skilled in the art may vary the details of construction and arrangement of parts without departing from the spirit of my invention, and therefore I do not wish to be limited to such features except as maybe required by the claim.

What I claim is In an internally fired boiler, the combination of a shell providing a tube chamber having a rear vertical and a horizontal bottom wall; a rear water chamber and a bottom water chamber in communication, and saidrear chamber communicating with the tube chamber; a plurality of fire tubes secured within the tube chamber; a fire box located intermediate the .bottom water chamber and the tube chamber; the walls of said bottom and rear chambers and the tube man-hole registering with and providing a chamber providing a flue and reversing man-passageway with said tubular body chamber; a tubular body of relatively large substantially as described. diameter connecting the rear Water chamber EDWARD KING.

5 With the tube chamber, and providing a flame guard for the juncture of the rear and bottom Walls of said tube chamber; and a Witnesses:

ARTHUR I. BUNDY, CARL ZUBLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

